The Story of Katerina Petrova

Part 4 Graduation

In Graduation, Katherine confronts Bonnie, demanding the immortality that she was promised in return for the tombstone containing Qetsiyah's calcified blood. When Bonnie informs her that she is out of luck since Bonnie was unable to contact Qetsiyah about the spell, Katherine gets angry and vengeful, and threatens to kill Elena, who she feels has a better life than she deserves. Bonnie threatens her right back, but is distracted by other students arriving for graduation, giving Katherine the opportunity to slink away. When Elena arrives back at the school looking for Bonnie and Jeremy before the veil is put back up, she is ambushed by Katherine, who throws her against lockers and kicks her around. After a few nasty comments from Katherine, Elena gets riled up and begins to fight back with almost equal measure. Katherine gains the upper hand, and is about to rip out Elena's heart when Elena pulls the cure out of her pocket and shoves it into Katherine's mouth. She forces Katherine's jaw shut to break open the vial as she struggles to get free from Katherine's grip. After a few moments Katherine falls unconscious next to Elena, who wishes her a "happy, human life." It is unknown what effect the cure will have on Katherine, though it is assumed that she will now be human. However, any potential side effects of taking the cure have not yet been revealed.

In I Know What You Did Last Summer, Katherine is first seen upon a street in Mystic Falls, paranoid and disheveled. She goes to the Salvatore house for help and she talks with Damon. She begs him for protection now that she is human, weak, slow and unable to protect herself against her numerous enemies, to which Damon reluctantly agrees.